i'd rebuild it. nothing inside really wears out, they just get dirty, usually the rubber on the accelerator pump gets dry and doesn't work. a couple cans of carb clean and a rebuild kit should make it like new.
I have to agree with burnzya. It would be best to make use of a carburetor rebuild kit for that but you might wanna double check if it already needs to be rebuild. But I'm also curious what make you think you already needs to rebuild your carburetor.